Mix first 5 ingredients in processor. Add shortening and cut in until mixture resembles coarse meal. Blend in enough buttermilk by tablespoons to form dough that begins to clump together. Gather dough into ball; divide in half. Flatten each half into disk. Wrap each disk in plastic and chill 45 minutes. ( Can be make 1 day ahead.)

For filling:

Position rack in lowest third of oven and preheat to 375F. Coarsely chop cranberries with sugar and pumpkin pie spice in processor. Transfer mixture to large bowl. Add apples, currants and flour and toss well.

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Roll out 1 dough disk between sheets of waxed paper to 13-inch round. Peel off top sheet of paper; invert dough into 9 1/2-inch-diameter deep-dish glass pie dish. Peel off paper. Fold under overhanging dough to form double-thick edge. Crimp edge. Roll out remaining dough disk on lightly floured surface to 1/8-inch-thick round. Using 3-inch-long leaf cookie cutter, cut out leaves. Using knife, mark veins in leaves. Slightly mound filling in pie dish. Arrange leaves around edge of pie and all over top, overlapping decoratively. Brush pastry all over with buttermilk.